Portion of an article of footwear



FIG. 1 is a perspective view of a portion of an article of footwear showing my new design;

FIG. 2 is a lateral side elevational view thereof;

FIG. 3 is a medial side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in FIGS. 1-7 immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. 

The ornamental design for a portion of an article of footwear, as shown and described. 